JP4814510B2 - Mobile device - Google Patents

Description

  The present invention relates to a portable terminal having a non-contact IC card function.

As shown in FIG. 9, the conventional mobile terminal includes a housing 41 having an electronic device 40 inside, and an antenna for non-contact communication that performs non-contact communication with an external reader / writer antenna 42 on the inner surface of the housing 41. A sheet-like flexible base material 43 having a non-contact communication antenna is stuck on the flexible base material 43, and the reader / writer antenna 42 or the internal The magnetic field generated from the non-contact communication antenna is prevented from being converted into an eddy current by the metal body or the shield case, and the outer surface 45 facing away from the inner surface of the housing 41 provided with the non-contact communication antenna is a reader. The performance of non-contact communication (hereinafter, simply referred to as “surface communication”) performed close to the writer antenna 42 has been improved (see, for example, Patent Document 1).
JP 2004-153463 A (page 4, FIG. 1)

  However, in the conventional portable terminal, although the surface communication performance can be improved, the outer surface 46 facing away from the outer surface 45 that is brought close to the reader / writer antenna at the time of surface communication is made close to the reader / writer antenna 42. In contact communication (hereinafter, simply referred to as “backside communication”), the metal part included in the electronic device 40, the housing 41, and the like and the reader / writer antenna 42 are magnetically coupled to reduce the inductance of the reader / writer antenna 42. Then, the resonance frequency of the reader / writer antenna 42 fluctuates outside the range where communication with the non-contact communication antenna is possible.

  For this reason, in the conventional portable terminal, the area where the non-contact communication antenna cannot communicate with the reader / writer antenna 42 while communicating with the reader / writer antenna 42 (hereinafter simply referred to as “ There is a problem that the communication performance is deteriorated.

  The present invention has been made to solve the conventional problems, and an object of the present invention is to provide a portable terminal that can satisfactorily perform non-contact communication with a reader / writer antenna without generating a dead band even during back surface communication. And

  The portable terminal of the present invention is provided in the housing, the electronic component mounting substrate provided in the housing and having the first and second surfaces, the first surface of the electronic component mounting substrate facing the first surface, A non-contact communication antenna that performs non-contact communication with a reader / writer antenna, and a magnetic body provided to face the second surface of the electronic component mounting board are provided.

  With this configuration, the mobile terminal of the present invention has a fluctuation in the resonance frequency of the reader / writer antenna caused by the magnetic coupling between the metal part included in the mobile terminal and the reader / writer antenna when the magnetic body and the reader / writer antenna are magnetically coupled. Therefore, it is possible to satisfactorily perform non-contact communication with the reader / writer antenna without generating a dead band even during back surface communication.

  In addition, the said magnetic body may be attached to the inner surface of the said housing | casing, and may be attached to the outer surface of the said housing | casing. The relative permeability of the magnetic material is preferably 15 or more.

  The present invention provides a portable terminal that can satisfactorily perform non-contact communication with a reader / writer antenna without generating a dead band even during back surface communication.

  Embodiments of the present invention will be described below with reference to the drawings.

  A portable terminal according to an embodiment of the present invention is shown in FIG.

  The mobile terminal 1 includes a lower housing 2, an upper housing 4 that is rotatably connected to the lower housing 2 via a hinge 3, and a first surface 5 and a second surface 6 that are provided on the lower housing 2. An electronic component mounting board 7, a non-contact communication antenna 8 that is provided in the lower housing 2 so as to face the first surface 5 of the electronic component mounting board 7 and performs non-contact communication with the reader / writer antenna, and non-contact A magnetic sheet 9 is provided on the electronic component mounting substrate 7 side of the communication antenna 8 so as to cover the non-contact communication antenna 8.

  At least one of the first surface 5 and the second surface 6 of the electronic component mounting substrate 7 is formed with a circuit for performing a call process, a communication process, a data process, and the like.

  The magnetic sheet 9 suppresses the generation of eddy currents in the metal contained in the electronic component mounting board 7 or the like that has received a magnetic field, and suppresses the weakening of the magnetic field received by the non-contact communication antenna 8. In the present embodiment, a magnetic body having a relative permeability of 35 is used as the magnetic sheet 9.

  The mobile terminal 1 is provided in the upper casing 4 and is provided in the upper casing 4, a main LCD (Liquid Crystal Display) 10 and a sub LCD 11 for displaying characters and images, and the lower casing 2 and the upper casing. An electronic component mounting board 14 having a first surface 12 and a second surface 13 facing the second surface 6 of the electronic component mounting board 7 when the body 4 is in close proximity; 2 further includes a magnetic sheet 15 attached to the inner surface of the upper housing 4 so as to face the surface 13.

  On at least one of the first surface 12 and the second surface 13 of the electronic component mounting substrate 14, a circuit for performing display control of the main LCD 10 and the sub LCD 11 is formed.

  The magnetic sheet 15 is made of a metal (such as a metal (16) for securing the strength of the upper casing 4 and included in the lower casing 2, the upper casing 4, the electronic component mounting boards 7, 14 and a battery (not shown). Hereinafter, it is magnetically coupled to “a metal part included in the mobile terminal 1”.

  Here, the magnetic material sheet 15 will be described in detail with reference to FIGS. 2 and 3. FIG. 2 is a schematic diagram illustrating an example of a positional relationship between the mobile terminal 1 and the reader / writer antenna during back surface communication.

  When the mobile terminal 1 and the reader / writer antenna 20 are in the positional relationship shown in FIG. 2, that is, the mobile terminal 1 and the center axis 24 of the loop pattern 23 of the reader / writer antenna 20 coincide with each other. When 1 is disposed, the degree of magnetic coupling between the loop pattern 23 and the metal part included in the mobile terminal 1, that is, the magnetic coupling coefficient is the largest. In this case, the fluctuation amount of the resonance frequency of the reader / writer antenna 20 becomes large, and the dead zone becomes the widest.

  The magnetic sheet 15 is disposed so as to be magnetically coupled to the reader / writer antenna 20 as shown in FIG. 3 when the positional relationship between the mobile terminal 1 and the reader / writer antenna 20 is the positional relationship shown in FIG. ing. When the fluctuation amount of the resonance frequency of the reader / writer antenna 20 is large, it is necessary to increase the relative permeability of the magnetic sheet 15 to some extent. Therefore, the relative permeability of the magnetic sheet 15 is 15 or more. Is preferred. In this embodiment, a magnetic material having a relative permeability of 60 is used as the magnetic material sheet 15.

  4 shows the distance between the portable terminal 1 and the reader / writer antenna 20 (hereinafter simply referred to as “communication distance”) when the portable terminal 1 is in the positional relationship shown in FIG. Is a graph showing the resonance frequency of the reader / writer antenna 20 measured while changing along the central axis 22 of the mobile terminal 1.

  Curve A represents the resonance frequency of the reader / writer antenna 20 when a conventional portable terminal is used instead of the portable terminal 1, and curve B represents the resonance frequency of the reader / writer antenna 20 when the portable terminal 1 is used. Is shown.

  It can be seen from the graph shown in FIG. 4 that the resonance frequency of the reader / writer antenna 20 rapidly increases when the conventional portable terminal or the portable terminal 1 is brought close to the reader / writer antenna 20. This is because when the communication distance is short, the magnetic coupling coefficient between the metal part included in the conventional portable terminal or portable terminal 1 and the reader / writer antenna 20 increases, and the resonance frequency of the reader / writer antenna 20 fluctuates. Because.

  However, when the curve A and the curve B are compared, it can be seen that an increase in the resonance frequency of the reader / writer antenna 20 when the mobile terminal 1 is used is suppressed. This is because the magnetic sheet 15 and the reader / writer antenna 20 are magnetically coupled, the magnetic coupling coefficient between the metal part included in the mobile terminal 1 and the reader / writer antenna 20 is reduced, and the metal part included in the mobile terminal 1 and the reader This is because fluctuations in the resonance frequency of the reader / writer antenna 20 caused by magnetic coupling with the writer antenna 20 are suppressed.

  FIG. 5 shows the communication success rate measured while changing the communication distance along the central axis of the conventional portable terminal when the conventional portable terminal is in the positional relationship shown in FIG. 2 with respect to the reader / writer antenna 20. It is a graph. 6 shows the communication success rate measured while changing the communication distance along the central axis 22 of the portable terminal 1 when the portable terminal 1 is in the positional relationship shown in FIG. It is a graph to show.

  Here, the communication success rate is the ratio of the number of successful communications to the number of trials in which data or commands are repeatedly transmitted and received between the conventional portable terminal or portable terminal 1 and the reader / writer antenna 20. For example, when the number of trials is 100 and the number of successful communications is 100, the communication success rate is 100%. When the number of trials is 100 and the number of successful communications is 60, the communication is successful. When the success rate is 60% and the number of trials is 100 and the number of successful communications is 0, the communication success rate is 0%.

  From the graph shown in FIG. 5, it can be seen that, in the conventional portable terminal, there is a portion where the communication success rate decreases as the communication distance is shortened. This is because the resonance frequency of the reader / writer antenna 20 has fluctuated until the reader / writer antenna 20 cannot communicate with the non-contact communication antenna.

  Here, when the communication distance is further shortened, the resonance frequency of the reader / writer antenna 20 is increased as shown in FIG. 4, and the magnetic coupling coefficient between the non-contact communication antenna and the reader / writer antenna 20 is increased, so that communication succeeds again. The rate is 100%.

  On the other hand, in the portable terminal 1, since the increase in the resonance frequency of the reader / writer antenna 20 is suppressed as described above, there is a portion where the communication success rate decreases even if the communication distance is shortened as shown in FIG. It has not occurred.

  According to the portable terminal 1 of the embodiment of the present invention, the magnetic sheet 15 and the reader / writer antenna 20 are magnetically coupled, so that the metal portion included in the portable terminal 1 and the reader / writer antenna 20 are connected. Since the fluctuation of the resonance frequency of the reader / writer antenna 20 caused by magnetic coupling is suppressed, it is possible to satisfactorily perform non-contact communication with the reader / writer antenna 20 without generating a dead band even during back surface communication.

  In the present embodiment, it has been described that the magnetic sheet 15 is provided on the inner surface of the upper casing 4. However, in the present invention, the magnetic sheet 15 is configured as shown in FIG. 4 may be provided on the outer surface.

  In the present embodiment, it has been described that the lower housing 2 and the upper housing 4 are pivotally connected by the hinge 3. However, in the present invention, as shown in FIG. Alternatively, the upper housing 4 may be integrally formed, and the electronic component mounting substrate 7 and the electronic component mounting substrate 14 may be further integrally formed. In FIG. 8, reference numeral 25 indicates that the lower casing 2 and upper casing 4 are integrally formed, and reference numeral 26 indicates that the electronic component mounting board 7 and electronic component mounting board 14 are integrally formed. Show.

  As described above, the portable terminal according to the present invention has an effect that it can satisfactorily perform non-contact communication with a reader / writer antenna without generating a dead zone even during back surface communication. For example, a non-contact IC card It is useful as a portable terminal having a function.

Sectional drawing of the portable terminal in one embodiment of this invention The schematic diagram which shows an example of the positional relationship at the time of back surface communication of the portable terminal and reader / writer antenna in one embodiment of this invention The schematic diagram which shows a mode that the magnetic material sheet and reader / writer antenna which comprise the portable terminal in one embodiment of this invention are magnetically coupled. The graph which shows the relationship between the communication distance between the portable terminal and reader / writer antenna in one embodiment of this invention, and the resonant frequency of a reader / writer antenna A graph showing the relationship between the communication distance between a conventional portable terminal and a reader / writer antenna and the communication success rate The graph which shows the relationship between the communication distance between the portable terminal and reader / writer antenna in one embodiment of this invention, and a communication success rate Sectional drawing of the other 1st aspect of the portable terminal in one embodiment of this invention Sectional drawing of the other 2nd aspect of the portable terminal in one embodiment of this invention Cross-sectional view of a conventional mobile terminal

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Portable terminal 2 Lower housing | casing 3 Hinge 4 Upper housing | casing 7, 14 Electronic component mounting board 8 Non-contact communication antenna 9, 15 Magnetic material sheet 10 Main LCD
11 Sub LCD
20, 42 Reader / writer antenna 41 Housing 43 Flexible base material 44 Soft magnetic wave absorber

Claims (5)

A housing having a first surface and a second surface;
A non-contact communication antenna that is provided on the first surface of the housing and performs non-contact communication with a reader / writer antenna;
A first magnetic body provided to cover the non-contact communication antenna;
A second magnetic body provided on the second surface of the housing ,
The housing has a first housing and a second housing,
The first housing has the first surface;
The second housing has the second surface.
Portable terminal, characterized in that. The first casing and the second casing are configured to be foldable with each other,
The first surface and the second surface are spaced apart from each other when the first housing and the second housing are in a folded state. Item 2. The mobile terminal according to Item 1 . Said second magnetic body, the portable terminal according to claim 1 or claim 2, characterized in that attached to the inner surface of the housing. Said second magnetic body, the portable terminal according to claim 1 or claim 2, characterized in that attached to the outer surface of the housing. The mobile terminal according to any one of claims 1 to 4 , wherein the relative magnetic permeability of the second magnetic body is 15 or more.

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